Vacuum chamber with a supersonic flow aerodynamic window

Details Vacuum chamber with a supersonic flow aerodynamic window Vacuum chamber with a supersonic flow aerodynamic window

1980-10-14

1982-11-09

Freeh, William L.

Pumps

One fluid pumped by contact or entrainment with another

Jet

328233, F04F 500

Patent

active

043582494

ABSTRACT:
A supersonic flow aerodynamic window, whereby a steam ejector situated in a primary chamber at vacuum exhausts superheated steam toward an orifice to a region of higher pressure, creating a barrier to the gas in the region of higher pressure which attempts to enter through the orifice. In a mixing chamber outside and in fluid communication with the primary chamber, superheated steam and gas are combined into a mixture which then enters the primary chamber through the orifice. At the point of impact of the ejector/superheated steam and the incoming gas/superheated steam mixture, a barrier is created to the gas attempting to enter the ejector chamber. This barrier, coupled with suitable vacuum pumping means and cooling means, serves to keep the steam ejector and primary chamber at a negative pressure, even though the primary chamber has an orifice to a region of higher pressure.

REFERENCES:
patent: 3546524 (1970-12-01), Stark
"Dynamic Pressure Stages for High Pressure/High Vacuum Systems" by B. W. Schumacher, Ontario Research Foundation, Physics Research Report 5806 (1958).
"Supersonic Flow Aerodynamic Windows for High Power Lasers" by E. M. Parmentier et al., Paper 72-710 of the AIAA 6th Fluid and Plasma Physics Conf., Boston, Mass. Jun. 26-28, 1972.
"Steam Ejectors" by B. D. Powers, High Vacuum Pumping Equipment, Chapman and Hall, Ltd., 1966, Chapter 4.
"Steam Ejector-Condenser-Stage 1 of a Differential Vacuum Pumping Station" by C. L. Hanson et al., Journ. of Vac. Sci. Technol., Apr. 1981, pp. 1164-1168.

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